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Home >> GMC >> 1991 >> Forward Control 3.9 L, SM465/M20 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Gasoline >> Trouble Code Charts >> Code 44, Lean Exhaust Indication (4.3L Turbo) >> Fuel Contamination
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Fuel Contamination

Water, even small amounts, near the in-tank fuel pump inlet can reach fuel injector, causing a lean exhaust and setting Code 44.